recorder: load full map and add author info

[bobrippling]

We now:

• No longer limit map drawing to tracks whose initial data contained a latitude (if (trackData.Latitude) { ... })
• Return after resolveing errors with track infos (this should be reject but I don't want to regress the slightly intertwined promise-heavy code)
• Have a slightly faster longitude/latitude lookup for previews
• Note BangleJS as the GPX author

I've also added a note about how we would specify the track type (run, ride, swim, etc) but not implemented this

[bobrippling]

@gfwilliams are you happy with GPX tracks exported from bangles being tagged as coming from here?

BangleApps/apps/recorder/interface.html

Lines 418 to 423 in 6b1d0e1

	<metadata>
	<author>
	<name>BangleJS</name>
	<link href="https://banglejs.com/" />
	</author>
	</metadata>

[gfwilliams]

I think that's fine - it should probably say Bangle.js instead though.

The link could actually reference https://banglejs.com/apps/?id=recorder - it might be helpful to differentiate that as the actual source?

[bobrippling]

Sounds good - updated. Will give it a little test